Surface-treating tool



A. A. CLARKE.

SURFACE TREATING TOOL.

APPLICATION FILED NOV. 23, 1920.

1,407,381, Patented Feb. 21, 1922.

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SURFACE-TREATING TOOL.

Application filed November 23, 1920. Serial No. 426,098.

To all whom it may. concern: 7

Be it known that I, ALEX A. CLARKE, a

citlzen of the United States, residing at Dallas, in the county of Dallas a'nd State of Texas, have invented certain new and useful Improvements in Surface-Treating Tools, of. which the following is aspecification. This invention relatesto new and useful improvements in surface treating tools.

The invention has particularly to do with that type of surface treating tools, in which a supporting frame, is provided with a motor propelled surface treating drum arcuately adjustable in said support.

The object of the invention is to provide a tool in which the surface treating drum is advanced to the work or retracted therefrom by arcuately adjusting the same.

11 apparatus designed to carry out the invention will be hereinafter described together with other features of the invention.

The invention will'be more readily understood from a reading of the following specification and by reference to the accompanying drawings, in which an example of the invention is shown, and wherein:

Fig. 1 is a side elevation of a tool constructed in accordance with my invention,

Fig. 2 is a plan view of the same, a portion being illustrated in section,

Fig. 3 1s a sectional detail on the line 3-3 of Fig. 2, and

Fig. 4 is a vertical sectional view on the line 44 of Fig. 3.

In the drawings the numeral designates an elongated frame having a flat base and side flanges 11 mer ed into a transverse central housing 12. The housing has a cover 13 fastened therein by machine screws 14. Upright handles 15 are provided at each end of the frame. The base of the frame has a central transverse slot 16.

At each end of the housing, a trunnion 17 extends inwardly. A transverse cradle 18 has at each end, a hub 19 receiving the trunnion at that end. The cradle is arcuate in cross-section, conforming to the general housing and its ends are flat. At the center of each. end of the housing, an angular socket 20 is provided. The sockets are below the hubs at which the cradle is pivoted.

A revolving drum 21 is mountedin the cradle. The drum contains the elements of an ordinary electric motor and is mounted to revolve on an armature 22 which has at swinging the cradle,

each end, an angular stud 23 filling in the socket 20 thereat; By this means the armature is held against rotation and the drum is supported in the housing. The motor may have a suitable source of electrical connection and other details which it is not considered necessary to illustrate. The drum 21 has a coverin or sleeve 24 of sand paper, felt or other a rading or polishing material, secured thereto in a suitable manner. The drum depends through the slot16 and the frame is moved longitudinally by means of the handles.

The essential feature of the invent-ion is the adjustment of the drum. It will be seen that the drum is journaled in the cradle 18 below the pivots of the latter and by the drum is raised or lowered. For swinging the cradle a wormgear segment 25 is fastened to one of the hubs 19 and is engaged by a worm screw 26. The worm screw is fastened on a shaft 27 which has its inner end supported in a bearin bracket 28 on the end of the housing. his shaft extends through a bearing collar 29 mounted in the side of the housing 12 and carries a bevel gear 30 on its outer end. The gear 30 meshes with a bevel gear 31 on the outer end of a transverse counter-shaft 32, supported in standards 33 raising the base of the frame.

A bevel gear 34 on the inner end of the counter-shaft meshes with a bevel gear 35 on the forward end of a central longitudinal adjusting shaft 36 which is supported in an upright standard 37. A thumb wheel 38 is mounted on the outer end of the shaft 36 in close relation to the adjacent handle) 15. p

The operator while grasping the handle may turn the wheel with his thumb and fingers It will be seen that the shafts are rotated by turnin the wheel 38, whereby the screw 26 is revo ved. The screw revolves the segment 25, whereby the cradle is swung. segment may be revolved in either direction from the central position indicated in Fig. 4, and the drum raised by being swung arcuately. Then by reversing the rotation of the wheel 38 and thus revolving the segment in the opposite direction, the drum is lowered as is obvious.

In using the tool the operator grasps the handles 15 and starts the motor so as to revolve the drum 21. By turning the thumb wheel 38 the screw 26' is caused to revolve through the agency of the parts 27, 30, 31, 32,

34, and 36. It will be seen that the screw revolves the segment 25 and this swings the cradle 18, whereby the drum 'is arcuately adjusted, thus being raised and lowered through the slot 16. If the drum is cutting too deep, the operator has merely to turn the wheel 38 and swin the cradle, whereby the drum is raised. 5 minute adjustment may be had and may be effected while the machine is in operation.

Various constructions may be used for adjusting the drum and the invention is presented as including all such modifications as properly come within the scope of the appended claim.

What I claim, is:

In a surface treating tool, an elongated frame having a lower face adapted to slidabl contact with the surface to be treated an to be manually shifted over such surface, handles arranged above the frame and secured to the ends thereof, a transverse housing formed upon the central portion of the frame, said frame being provided beneath the housing with a transverse opening, trunnions secured to the housing at its ends and projecting inwardly, a cradle having openings in its ends to pivotall receive said trunnions, the ends of the crad e extending downwardly below the trunnions, a rotatable surface treating drum connected with the lower In testimony whereof I aflix my signature.

ALEX A. CLARKE. 

